Hi Prasad,
Greetings from Syncfusion.
We have validated your reported scenario. By default, when smartlabels are enabled, overlapped data labels will be placed next to that label with connector lines. Since data label font color is white, label is not visible. You can either specify different color for label, or you can disable zero data labels using a property showZero.
<e-accumulationseries-datalabel showZero="false" visible="true"> </e-accumulationseries-datalabel>
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Datalabels default font color black
When showZero is disabled
Please revert us if you have any concerns.
Regards,
Durga G